Mr Brown, who was in training with the Royal Electrical and Mechanical Engineers in Bordon, was pronounced dead at the scene.

The Independent Police Complaints Commission (IPCC) will now investigate the police driver's response to the call, as to whether it was appropriate for the road and weather conditions at the time.

The officers involved will also be examined as to their experience in relation to driving police vehicles in response situations.

The westbound carriageway of the A31 was closed between the A3 slip road and Puttenham for almost 12 hours while investigations took place.

IPCC commissioner Jennifer Izekor said: " This is a tragic death of a young man with his life ahead of him and my thoughts are with his family at this very difficult time.

“I would like to assure them this will be a thorough and rigorous investigation to establish all of the circumstances surrounding Joshua’s death.”

An IPCC family liaison manager has been communicating with Mr Brown's relatives.

A post-mortem examination took place on Tuesday and established the cause of death as head injuries consistent with a road traffic accident.

Tributes have been paid to Mr Brown, including on Facebook where friend Scott Bridge wrote: "Josh Brown, I saw you as a brother, someone to look up to and one of the closest friends I've ever had the pleasure of having.

"I'm gonna miss all the nights out we had, all the gym sessions and just meeting up with you when I got back from leave.

"I remember when you told me you was joining the army and you asked me all the questions about it. I was so glad when you told me you got in."

Amy Sly, posting on Twitter, said: "He will be greatly missed by all that knew him! What a great guy! RIP Josh Brown."